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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d02f5a4c856c78f8a440c2df8e94a90d1cc24709506e76dc528c1dd61a99771' 
  AND token = 'cUt+XBLRLyvWSa5IiO5khcvfx/y6sRg0X9GOmaVqg6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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