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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bae570fae48d7fc09e193c9fbdcdc8cf8ae30ea63ea4e572b6e18d741ea9acf' 
  AND token = '62fyAVX6Z9TGUN8FabtPBZ0nk4kDKP0CRdr4HVgH06s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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