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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef4b2f3c2ec9902cfa899090cba4ebd17974973befe15fc6dbfc42f432a14bc' 
  AND token = 'mh6I2jH1BdIs+b3fL6shMgBpHv4C6p9Is13VGNkzlLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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