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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e60ec6046e5c26338b5c4160c36c5022feeaf5c6134c1885182530509c6f0de4' 
  AND token = 'xxToN+sa1Tvw4FsJg+DX3p3X3Ry8FoeYOEHdiQ4L4jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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