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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79e5dd19501a671f5331720a7b2f4fcfb2d848acf68b1cf2a2101e1d5845e968' 
  AND token = 'bNgu/bsWdQAWuroM5H6Y6Ed8oLoXF7B0FPSu6HzFV4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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