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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f398de6108d323324c61e7d226d062ed86737b3f159c871a4da32655e2d2ffac' 
  AND token = 'SEznGM2hV4QWU2yz17NzLY/6bRpDaqxPpFWhz5aIUDE=' 
  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"
    }
  }
}