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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd840a328e2adaccc02b3079a11bfc89c7e3ddbb9527fa5e325fe367dbd55eed3' 
  AND token = 'Pm0iQkaB8c1MJMBc+8itSsZ0fHpk8jrNvWEGDI3f9SY=' 
  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"
    }
  }
}