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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c261b4f1844163f5da44338b70df34a64b94c5f2a4baa24dd975ab8c08a736' 
  AND token = 'BZRQj28P4lLiKIyu13tNXx7jynimZ2LGMRi8Cz7jZkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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