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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0311a6313d5a7b4958e54531918ccd68da689f24f48c38daffc7682173d687d' 
  AND token = 'k0vJLmQKzxO3CMbXaRq3v0/pceRHh4bUHTrCVkvmKb0=' 
  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"
    }
  }
}