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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e2fcd5530e12cb2bc35669aa17a9f3b4776f7860e955a0cb06686db9401e00c' 
  AND token = '66XQ6GY0WbNcapJU/F+ptrbRnWeoBR+iTJgdI5MCMy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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