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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a2d4e51af6d746224724c1f35dadd4af28f188f3331ba2fd33cf34fd376320' 
  AND token = 'arrjdnTIYq6rIS5hV/bVw/13YK0fky5/n3PSNcPhp0c=' 
  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"
    }
  }
}