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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f2411d931a7db66b7b889052de2b765414cc6f5d8837664e57d26a02c36b52' 
  AND token = 'lX/IoxWZOigcH2agdGtaW9Rq4egB5iPV4/LGv/l0ryQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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