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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95cc34308d7e2f037a47df81daec0567ef1db50cb16479b737547ca111baa7fe' 
  AND token = 'f42Bh0RHjfsmy58xN29KUAr7M75bGrt/UouWO2iZQ84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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