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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438092247c144da71bdb321c81285e5e88158acd820aa7f24988ad398a392cc7' 
  AND token = '3PYWMc4IoG975sWRtttrHOMvFB2R3niWqSP+3MNUuqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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