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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f2615e19327e9b04f66df3cc4b643c6c83bcf0c1b6db2f3806b10b9579b9ed9' 
  AND token = 'Jm9Hw8UjQ4ZtiznS9mf7GoCN2VomIAEKQvyoIoWNX/o=' 
  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"
    }
  }
}