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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2167a6a6593b4df0798531b1142787c15e4375b1196cce0c707f8f3a4825580' 
  AND token = '+ODI0hk/M5RaHOafDNPDdkL18ViIMlFB2obKwu8UX6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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