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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c97e7f35e3f2851193d07774ee776eb4f6d08ec9b4044fa57a4d667c1b07b70' 
  AND token = 'Ax3BM1qg9Qy7IJX1lRqRfYXO5pqi2gqqTW9qR+Hqe0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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