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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040ec72ea8b8ba4e1c4b866e4bde7c83b9eae54a6dee13f1a94c8a4104b3adc6' 
  AND token = 'dd2aaPoAMiAxqWuxvvX/rVdUDndbZ1nhPoEKsu+8CBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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