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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7b3fb4cc2b90e6b9364cb1983d0e93c61eb3234f82a93f022d9ccb09a74448' 
  AND token = '7WtNpPVUt+ikDxNggpd1nObLW9A+2m3sx0Q9rJatuRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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