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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc5da7991a5aa452f68a9c9a2b259eebe7a1a451075e64fcaaa9fe63d55535ff' 
  AND token = 'AJHolOkSxVfIdTFYMee4vdt8tq9NWpfYOhTNfpv6iGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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