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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '856e6a6b680d976718427e524b85a9361203167842918b1a1fc11990089137dc' 
  AND token = 'gAXKfTgPGGZs8VPyw72V9dWuZ9eX3ceLtTNrjcEIK4Y=' 
  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"
    }
  }
}