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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee075b7179a5176ef56f399e54c7c4f8ab0b60353dbef614c79c18529566e88a' 
  AND token = 'rUZGm95vL28jx1dkk4XXIbf3LzWgbOLR4O1TBkMIAV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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