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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a0a94f8e200de2e7f419305b8a3ea9bf47b3b175ca0edc99848df06880cef27' 
  AND token = 'uXrUQr4TPqlHO4UA1vHo5UYT/pA59vPNJFapR/09GHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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