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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb5edc9f45fc5f12e784f37ad59864e61dd5bd895cfd4917a8255096f55bcd3' 
  AND token = 'EL4vj/eIV05ytSq4W4cksvku3y5qxhsT4C9rH6/5K0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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