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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc1d8626023d921bb7c238ec8c8d635c82e5b361fafad76c4d352e7ae52ef0a' 
  AND token = 'W5/NaoX/a4AcRjm4upo9bf8YoL12d7kUJcsadd53Vp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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