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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e3f18f953cff29e51dfce7fd9c2c0f5f1374c81bb8dda0c7f8af7f92d5dc76' 
  AND token = 'up8Qmu/d9bnVeVjUvJ4nUyxP4JCr4SwQLqFpG1nBlcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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