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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '506ea6f792e4627516152b7c303c06a0ffe6e97da257f06df9d00ac9fef51676' 
  AND token = 'Vlq2sWA7BDnDLR8uEUVs7UXB0/1vZfzG6jWxsP7d8sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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