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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46c8e3dd487e80b145ae30df506871500ef44a9933927c5030de9523b5357e32' 
  AND token = 'N/p8YFDSAFxYSw/u9G5ciJrRP/MlAeTeJ6TRv/GeN/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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