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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b181b30df4502822475c83a5c433820c75c978ba8be47d3fbefd0d536ce01a03' 
  AND token = 'DGczsykazpI/21h/mC6LhFbo2BYoefSibmV9snsIGCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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