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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102bfd3410a833da5fc1a3774b1108b5729015fb85c8966ade44d0166d9abd5b' 
  AND token = '2o6roO5XloQR/zkh8MWxEpkoNGP0Spmi3SOlPy57LjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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