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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9deb2c4f0559f6e9fb9a204338b7517422c6dc2aeb55bccde99160d7cf9926e4' 
  AND token = 'mHOOR7HwnhuhlXT9CqdF+IRsP5FuLDE0jHZ2x7WoJ2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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