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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25048c1d1722cd36c26f7c998e260715898605d9e6424db9d191b3e9d4ff6bfc' 
  AND token = 'Savy+llpKhCyLG7NA7EIRs2doCnkNitt5B7/CsAYIkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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