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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf9d2b02a00a314f0435b539dadfae152ce8a6f3cb0688d241de33e611e5059' 
  AND token = 'rwKsyiyibaSO/ut79aESQi6Q4Rdb6A1a2oe02z1dX6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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