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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '902017893f538ada93860d39a1a10390076eaa04d3dacd9e34e197e2e3811cef' 
  AND token = 'yE8f3XB7xpIDY/A3rLejya5IH4Cksb9ygBuOOFgCkIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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