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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b2b344d27b64df348ef5972259c44ce8d3af0bd10c9659064d0c508bc40668' 
  AND token = '4eRzIVX524zy3I4dy35yvFTxff6cDTgSzZpT1K75oa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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