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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5acfae19cda5c0485fac97c79ab5a4eef85670f5529788e464823074667a53ba' 
  AND token = 'R/TmP+Vt/mzHrkVC1seC5sbjuFS4oFEbY342qjv83/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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