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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba0997b704f4b3823c59523cf1d1cc05e8d2516bbebaeb7b29abb60c74c9dc9' 
  AND token = '5EpBqAsSLxyYN7a1nF/4wbcFICnWaeFp6RItSCbEKT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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