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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b29c99dc40e493f1b777b92db04ab3fb977ba8241953d377093b5d6e70a3397a' 
  AND token = 't8ChAOjd/hJ9oQAIsr8tbv32fPuwvviR9O2Yb6VTR9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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