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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb703ab0a8f0c38f7abc6127fdf2b18589e31b67ad6b5f0e342da6d3810ecc5' 
  AND token = 'i5PpdWyuXMd2JCZU+fVaZoteoZk5H2xGm5U+SM6IwWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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