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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3e70ae178bdbdb79dc5239d8a65e010e1dda20d359b635521035cda26091cb' 
  AND token = 'ldv/IysKskfRn2IEjM47BjA//Tm1YyPcTdAbo6oQ8mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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