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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe8ba1d46e4e653d32f85615048b8a5255f935f2bb898d4ac7425f1c581f3ff4' 
  AND token = '7L1ByLMEPaQibZ8UKzMhmr082nwWWrHfWmo33mWBE04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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