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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '067c92b63e6ba665901ef7ca0ea9f2f8cce93acd27f8621c312f760bbbfe4a78' 
  AND token = 'u+LgMoXMMKkIHnRIRPJNkLg2R2lXbg7hFASsh4OTLIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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