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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c806f298e0df57c241e1a2aec225ce9d06e5f2a9a14740b83c75583a39a11d1' 
  AND token = 'rCnE8taK0Zus8DCasd+0zMtFRrHy7WkcNOtDBdBEfdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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