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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3abc80a8266bf673ae0deab2c9d0acb6e397025f6eeb3dc885efbf7a8a7d67e' 
  AND token = 'ewaeWqWHfhYyS10Oc4G5cGllLgcBR6+qlrhb4f+fq5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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