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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6902eb0f90f55d122721d64d8ede3150d6dc69f5cedcf5759c7c7a61e4a6b8eb' 
  AND token = 'T8fZ/7hoeeKtyHi6sLIXGDIa93uhuVogi5/lQ6GDxPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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