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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '300b2bc66850ce12baa19938b18a2038fb9ee0690b5ba0c9a5b5f10b30a4e14e' 
  AND token = 'Rd4/GsJb0K2B8r0TgRP8z3TxV0OScmwoLIejXA0tpGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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