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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f01294ef5e208fd21c26e1ac5a069d915b00ba3a8b04879e4e11d9b0dbce66a' 
  AND token = 'bk6WP0N6vyAhwG0NpKiGzfGO4m3gxnmMngC4P37kT3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}