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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2b2d26c7d86cfd06199c991aaa743f74a3b2c84347a73ad1501c8d845cffbc' 
  AND token = 'Yg1opnvagTg+DNZGNn2/yhfmzZxnk8tWzH3aPY1Tl/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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