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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3c8b870d8d0906b7f62817cea8b93109a8609d40ca11ada4f2d154249e5c33f' 
  AND token = 'FNiXNTCBD85GPrko2Goj2sBPl4/BRXztt3TyLWT4oDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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