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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9172e00ed188535c047ae9f9a9fdb6622c0d35722d0f1f7a2327f06886a35a32' 
  AND token = 'hYMQMS+KhvVAlstQYU4IbCE7+otOJbQt6yzEFdk1n4A=' 
  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"
    }
  }
}