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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14e0133aa0eba59f01a7cc2dc29115ed6e6d1238a6ac6ddae124cb8c2c1cf72' 
  AND token = 'KpBDgkNPSQhf8L/KpnB5h018I/yGoa64D6C6IFD0u4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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