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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0b1e7b06a16529b14a088992ba934f51651647b799ea900a0951d96595e58e' 
  AND token = 'YFvWa7NVT4VG8P/DPfzhVxNwbKM0TMHVNCbd5NOfa8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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