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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '567ec9d6e09ff4947b2c769324c5eb1200c774547522e91cba6fe2cb890df4cf' 
  AND token = 'dzr6cO7v0vMR1qnhsKeiYgZNPGu6+Mn74U7N1ez529g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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