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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6973e8a3c519e0e972884afba962c43d37d0c0f567ce2795b8274ddb2c74652f' 
  AND token = 'n6rWuThJ1mvE9Fn0O08El33Pcashi3g263+yTPj33uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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