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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a182b5fd20e4ca5ea3f0806e012238a5792cad4e856dd380d000f45af70a1aca' 
  AND token = '9Trjdgp9Y9se46R6vqaz2Kjfy+8evyW5Cgn5dPRsNF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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