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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a4dd0899544fc6819dd305e49e149bbbfc744f3f2912e7863ca3abe77c42e3' 
  AND token = '81VzA8X5Q6IwhxBVedzdVKQsZPUakmnM7lWZZWmjI6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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